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Choose the correct order of enthalpy of ...

Choose the correct order of enthalpy of formation, `DeltaH_(f)^(@)` for halides of alkali metals :

A

`NaFltKFltRbFltCsF`

B

`NaClgtKClgtRbClgtCsCl`

C

`NaBrgtKBrgtRbBrgtCsBr`

D

`KFltKClltKBrltKI`

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`DeltaH_(f)^(@)` for fluorides become less negative as we go down the group, whilst the reverse is true of `DeltaH_(f)^(@)` for chlorides, bromides and iodides.
For a given metal, `DeltaH_(f)^(@)` always becomes less negative from fluride to iodide.
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